Update PHPExcel to solve string comparaison bug #2359

See https://github.com/PHPOffice/PHPExcel/issues/31
Output both PHP and CSV files on first run #2359
Avoid hitting non-existing cell #2359
Update PHPExcel to solve string comparaison bug (bis) #2359
Loosen unique constraint for FilterQuestionnaireUsage #2359

It's possible to use the same formula at both levels. This is required
for the (very) edge case of Kyrgyzstan Tables_W!X90 which refers to a
non-existing formula. So X90 own formula will be transformed to '=NULL'
which happen to be the exclude rule.
Order rows of /browse/table/questionnaire like Excel files #2359

This is not critical and could be later change to a better values
(eg: year, name), but for now it makes comparison much easier
Add, link and update questions filter for filterset  "Level of development and implementation of policy / plan" #2385
Add, link and update questions filter for filterset  "Elements of sustainability in policy and level of implementation" #2385
Add local header
Standardize Survey code when extracting data from Excel files #2359
Also convert simple formula from 0-100 to 0.00-1.00 #2359

Some formula contain not only numbers, but simple formulas such as
additions. We also need to convert those, as seen in Solomon Islands
Update PHPExcel to fix a bug for expected results #2359